CN104184573A - Implementation method for LTE-Advanced wireless signal synchronization and tracking - Google Patents
Implementation method for LTE-Advanced wireless signal synchronization and tracking Download PDFInfo
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Abstract
The invention relates to an implementation method for LTE-Advanced wireless signal synchronization and tracking, and belongs to the technical field of wireless communication. In the method, a working mode based on event drive is adopted in both a transmitting end and a receiving end of an LTE-Advanced wireless communication test platform; under the driving of external events, the state of the transmitting end is shifted among the three states of the non-start state, the awaiting state and the transmitting state, and the state of the receiving end is shifted among the four states of the non-start state, the asynchronous state, the intermediate state and the synchronous state; synchronization of the receiving end and the transmitting end is achieved by means of main synchronous signals and auxiliary synchronous signals included in LTE-Advanced wireless frames, and synchronous tracking and synchronous loss judging are carried out. It is ensured that the transmitting end and the receiving end can be shifted into the asynchronous state in time when offset appears in a time domain or a frequency domain according to the method, and an upper layer is reminded of synchronous loss. After synchronous loss occurs, the receiving end and the transmitting end of the test platform can be made to enter the synchronous state again by updating synchronous points of the time domain and corrected values of the frequency domain according to the method.
Description
Technical field
The invention belongs to mobile communication technology field, relate to the synchronous implementation method, the particularly down-going synchronous of a kind of LTE-Advanced radio communication test platform sending and receiving end and the implementation method of tracking with following the tracks of of a kind of LTE-Advanced wireless signal.
Background technology
In mobile communication technology field, LTE-Advanced (Long Term Evolution-Advanced) is wireless communication system standards of new generation.No matter be in industrial quarters or in scientific research institutions now, mainly adopt software radio mode to build test platform, for the radio communication new technology to LTE-Advanced, design, test and verify.
In test process, in test platform, synchronizeing between wireless transmitting terminals and receiving terminal is the basis of the normal work of test platform.LTE-Advanced does not make concrete regulation to synchronous techniqueflow, has only stipulated that synchronizing signal generates and the mapping mode in radio frames.The present invention proposes a kind of LTE-Advanced of meeting standard, realize the method for transmitting-receiving two-end down-going synchronous and tracking, can realize and keep the down-going synchronous of wireless test platform transmitting-receiving two-end.
Summary of the invention
In view of this, the object of the present invention is to provide the synchronous implementation method with following the tracks of of a kind of LTE-Advanced wireless signal, the method can effectively realize and keep the down-going synchronous of test platform transmitting-receiving two-end.
For achieving the above object, the invention provides following technical scheme:
The synchronous implementation method with following the tracks of of a kind of LTE-Advanced wireless signal, in the method, the transmitting terminal of LTE-Advanced radio communication test platform and receiving terminal all adopt based on event driven working method, externally, under the driving of event, transmitting terminal state is not shifting between starting state, waiting state and three states of transmission state; Receiving-end state is not shifting between starting state, asynchronous state, intermediate state and synchronous state one of four states; Master sync signal and auxiliary synchronous signal that utilization is included in LTE-Advanced radio frames are realized the synchronous of transmitting-receiving two-end, and carry out synchronous tracking and synchronization loss judgement.
Further, described transmitting terminal state is in starting state, waiting state and send between three states of state and do not shifting and specifically comprising: 1) transmitting terminal generates data to be sent by the LTE-Advanced standard of eating dishes without rice or wine; 2) test platform is accepted user instruction by graphic user interface, calls top-level module top_block.start (), and transmitting terminal never starting state enters waiting state; 3) condition that transmission state starts is to have data to need to send, and countless, while sending according to needs, system rests on waiting state, and transmitting terminal still sends control information; 4) until while having data to send, enter transmission state; 5) need only in buffer memory and still have data to need to send, system will send continuous transmission data under state, until data are sent or the top_block.start () in external event triggering top_block makes system reenter waiting state; 6) when top_block.stop () is effective, transmitting terminal USRP quits work, and reenters not starting state.
Further, receiving terminal total not starting state, asynchronous state, intermediate state and synchronous state one of four states, described receiving-end state is not shifting and is specifically comprising between starting state, asynchronous state, intermediate state and synchronous state one of four states: 1) call after top_block.start (), receiving terminal proceeds to asynchronous state; 2) under asynchronous state, receiving terminal does not need to do information decoding, only carries out to the received signal thick synchronous; 3) if no signal every a period of time, do again synchronously; 4), if signal exists, carry out synchronously, then by intermediate state, proceeding to synchronous state; 5) synchronous and base station IDs identification is received and dispatched in the transmitting-receiving two-end utilization of test platform is included in radio frames master sync signal PSS and auxiliary synchronous signal SSS realization.
Further, master sync signal and auxiliary synchronous signal that described utilization is included in LTE-Advanced radio frames are realized the synchronous of transmitting-receiving two-end, and carry out the judgement of synchronous tracking and synchronization loss, specifically comprise: when time domain or frequency domain appearance skew, transmitting terminal and receiving terminal proceed to asynchronous state in time, prompting upper strata synchronization loss; After synchronization loss, by upgrading Domain Synchronous point and frequency-domain correction value, make the transmitting-receiving two-end of test platform again enter synchronous state.
Further, LTE-Advanced synchronizing signal comprises master sync signal PSS and auxiliary synchronous signals SSS, and the time span of each synchronizing signal is 1 OFDM symbol, and every 5ms transmission primaries takies the bandwidth of downstream bands center 1.08MHz on frequency domain.
Beneficial effect of the present invention is: method of the present invention can guarantee that transmitting terminal and receiving terminal proceed to asynchronous state in time, prompting upper strata synchronization loss when time domain or frequency domain appearance skew.After synchronization loss, this method can make the transmitting-receiving two-end of test platform again enter synchronous state by upgrading Domain Synchronous point and frequency-domain correction value.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearer, the invention provides following accompanying drawing and describe:
Fig. 1 is LTE-AdvancedFDDType1 frame structure schematic diagram;
Fig. 2 is test platform transmitting terminal state transition diagram;
Fig. 3 is test platform receiving-end state transition diagram;
Fig. 4 is synchronous tracking and loss judgement flow chart;
Fig. 5 is synchronous point location schematic diagram;
Fig. 6 is the GNURadio internal memory schematic diagram that aligns frame by frame.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
In method of the present invention, the transmitting terminal of LTE-Advanced radio communication test platform and receiving terminal all adopt based on event driven working method, externally, under the driving of event, transmitting terminal state is not shifting between starting state, waiting state and three states of transmission state; Receiving-end state is not shifting between starting state, asynchronous state, intermediate state and synchronous state one of four states; Master sync signal and auxiliary synchronous signal that utilization is included in LTE-Advanced radio frames are realized the synchronous of transmitting-receiving two-end, and carry out synchronous tracking and synchronization loss judgement.
Specifically:
For achieving the above object, test platform transmitting terminal and receiving terminal all adopt event driven working method, and externally, under the driving of event, transmitting terminal is not shifting between starting state, waiting state and three states of transmission state; Receiving terminal is not shifting between starting state, asynchronous state, intermediate state and synchronous state one of four states.
Master sync signal and auxiliary synchronous signal that utilization is included in LTE-Advanced radio frames are realized the synchronous of transmitting-receiving two-end, and possess synchronous tracking and synchronization loss arbitration functions.As shown in Figure 4, when time domain or frequency domain appearance skew, transmitting terminal and receiving terminal proceed to asynchronous state to flow process in time, prompting upper strata synchronization loss; After synchronization loss, by upgrading Domain Synchronous point and frequency-domain correction value, make the transmitting-receiving two-end of test platform again enter synchronous state.
LTE-Advanced synchronizing signal comprises master sync signal PSS and auxiliary synchronous signals SSS, and the time span of each synchronizing signal is 1 OFDM symbol, and every 5ms transmission primaries takies the bandwidth of downstream bands center 1.08MHz on frequency domain.The sequence that PSS/SSS signal is used is relevant with physical-layer cell ID, can be used for the identification of terminal to community.
LTE-Advanced physical layer is supported 504Ge community ID, is divided into 168 groups (0-167), and each group comprises San Ge community ID (0-2).
Corresponding, there are 3 kinds of master sync signal sequences, ID in the group of indicating cell; There are 168 kinds of auxiliary synchronous signals sequences, indicating cell group ID.
In FDD Type 1 frame structure, as shown in Figure 1, PSS/SSS signal lays respectively at the 0th subframe and the 5th subframe in radio frames, and PSS/SSS is arranged in two continuous OFDM symbols.
The master sync signal characteristic sequence of the signal receiving and local generation is done to slip relevant, detect the position of relevant peaks; The position that receives master sync signal in signal can be determined in the position occurring according to relevant peaks, has so far realized field sync.But definite master sync signal may be in the 0th time slot of radio frames; Also may be in the 10th time slot.Therefore, then utilize auxiliary synchronous signals further to judge that above-mentioned master sync signal is the 0th time slot that is arranged in radio frames, be still arranged in the 10th time slot, achieve frame is synchronous accordingly.Because the spacing of master sync signal and frame head is fixed, can determine accordingly the original position of next frame.Utilize the discard of software radio GNURadio to discharge the data before next frame original position.From next work period, the data in internal memory are alignd, and have realized down-going synchronous and the tracking of transmitting-receiving two-end.
No matter be the common software radio peripheral hardware of anolog base station or the common software radio peripheral hardware of analog subscriber, transmitting terminal, receiving terminal all adopt state machine mode to carry out programming.
As shown in Figure 2, total not starting state, waiting state and three states of transmission state of transmitting terminal.
Transmitting terminal generates data to be sent by the LTE-Advanced standard of eating dishes without rice or wine; Test platform is accepted user instruction by graphic user interface, calls top-level module top_block.start (), and transmitting terminal never starting state enters waiting state; The condition that transmission state starts is to have data to need to send, and countless, while sending according to needs, system rests on waiting state, and transmitting terminal still sends control information; Until while having data to send, enter transmission state.
Need only in buffer memory and still have data to need to send, system will send continuous transmission data under state, until data are sent or the top_block.start () in external event triggering top_block makes system reenter waiting state.
When top_block.stop () is effective, transmitting terminal USRP quits work, and reenters not starting state.
As shown in Figure 3, total not starting state, asynchronous state, intermediate state and synchronous state one of four states of receiving terminal.
Call after top_block.start (), receiving terminal proceeds to asynchronous state; Under asynchronous state, receiving terminal does not need to do information decoding, only carries out to the received signal thick synchronous; If no signal, does synchronously every a period of time again; If signal exists, carry out synchronously, then by intermediate state, proceeding to synchronous state.
The transmitting-receiving two-end utilization of test platform is included in the master sync signal PSS in radio frames and auxiliary synchronous signal SSS realizes transmitting-receiving synchronously and base station IDs identification.
Synchronous tracking with loss adjudicated flow process as shown in Figure 4, when this flow process can guarantee that the skew of time domain or frequency domain occurs, transmitting terminal and receiving terminal can proceed to asynchronous state in time, prompting upper strata or graphic user interface communication link synchronization loss, avoid the situation of no signal to be mistaken for and to occur time-frequency domain skew.
In Fig. 4, continuous several times successively decreases and judges that the state that can avoid bursty interference to cause is set frequently to be switched by row or column.Utilize local 168 kinds of characteristic sequences that generate with receive signal do slide relevant, the position of detection relevant peaks.The position of master sync signal can be determined in the position that utilizes relevant peaks to occur, obtains in cell set
utilize auxiliary synchronous signal SSS achieve frame synchronous, and carry out by the SSS with possible the group that related operation obtains community
then utilize formula
calculate respective base station
after having determined the position of maximum correlation, can know cell set ID and judge current is in time slot 0 for synchronous SSS, or in time slot 10.
In test platform, data Yi Zhengwei unit processes.
The length of one frame is 10ms, and every frame comprises two PSS and two SSS; From time domain, every frame is comprised of 140 OFDM symbols.Owing to there is the protection of Cyclic Prefix, can directly use thick synchronous result to obtain the OFDM character position of 140 PSS possible in every frame; Then the data of these 140 possible positions are done to FFT conversion, the frequency domain sequence of acquisition carries out related operation with possible PSS sequence, the result of acquisition 140*3 correlations computing.After more above-mentioned correlated results, maximum present position can be obtained, according to this maximum present position, the base station that sends this signal can be determined
calculate PSS present position in current cache.After having obtained the position of PSS, by 9 correlations in this position neighborhood, carry out further accurate location as shown in Figure 5.
In Fig. 5, the value of center is the correlation of the sync bit after thick synchronous and thin frequency offset correction, and the value of all the other 8 points is at possible time partially ± T
sor frequency deviation ± f
sunder correlation.
If the correlation of center is maximum, accurate positioning is described;
If the value of other certain position is maximum, and the correlation in maximum periphery field successively decreases by row or column, synchronous point is adjusted to maximum correlation position;
If the correlation in maximum periphery field successively decreases not according to row or column, explanation exceeds synchronous following range, and receiving terminal has entered asynchronous state.
Being alignd in two kinds of destroyed situations to frame under synchronous state conversion and synchronous regime by asynchronous state, by interpolation intermediate state, utilize the spatial cache release function that in Fig. 6, GNU Radio carries, realize the alignment frame by frame of GNU Radio data in EMS memory.
From next work period, the data in GNU Radio internal memory are alignd, and have realized the down-going synchronous between transmitting terminal and receiving terminal.
Finally explanation is, above preferred embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is described in detail by above preferred embodiment, but those skilled in the art are to be understood that, can to it, make various changes in the form and details, and not depart from the claims in the present invention book limited range.
Claims (4)
1. the synchronous implementation method with following the tracks of of a LTE-Advanced wireless signal, it is characterized in that: in the method, the transmitting terminal of LTE-Advanced radio communication test platform and receiving terminal all adopt based on event driven working method, externally, under the driving of event, transmitting terminal state is not shifting between starting state, waiting state and three states of transmission state; Receiving-end state is not shifting between starting state, asynchronous state, intermediate state and synchronous state one of four states; Master sync signal and auxiliary synchronous signal that utilization is included in LTE-Advanced radio frames are realized the synchronous of transmitting-receiving two-end, and carry out synchronous tracking and synchronization loss judgement.
2. the synchronous implementation method with following the tracks of of a kind of LTE-Advanced wireless signal according to claim 1, is characterized in that: described transmitting terminal state is in starting state, waiting state and send between three states of state and do not shifting and specifically comprising:
1) transmitting terminal generates data to be sent by the LTE-Advanced standard of eating dishes without rice or wine;
2) test platform is accepted user instruction by graphic user interface, calls top-level module top_block.start (), and transmitting terminal never starting state enters waiting state;
3) condition that transmission state starts is to have data to need to send, and countless, while sending according to needs, system rests on waiting state, and transmitting terminal still sends control information;
4) until while having data to send, enter transmission state;
5) need only in buffer memory and still have data to need to send, system will send continuous transmission data under state, until data are sent or the top_block.start () in external event triggering top_block makes system reenter waiting state;
6) when top_block.stop () is effective, transmitting terminal USRP quits work, and reenters not starting state.
3. the synchronous implementation method with following the tracks of of a kind of LTE-Advanced wireless signal according to claim 2, is characterized in that: described receiving-end state is not shifting and specifically comprising between starting state, asynchronous state, intermediate state and synchronous state one of four states:
1) call after top_block.start (), receiving terminal proceeds to asynchronous state;
2) under asynchronous state, receiving terminal does not need to do information decoding, only carries out to the received signal thick synchronous;
3) if no signal every a period of time, do again synchronously;
4), if signal exists, carry out synchronously, then by intermediate state, proceeding to synchronous state;
5) the transmitting-receiving two-end utilization of test platform is included in master sync signal (the Primary Synchronization Signal in radio frames, PSS) and auxiliary synchronous signal (Secondary Synchronization Signal, SSS) realize the synchronous and base station IDs identification of transmitting-receiving.
4. the synchronous implementation method with following the tracks of of a kind of LTE-Advanced wireless signal according to claim 3, it is characterized in that: master sync signal and auxiliary synchronous signal that described utilization is included in LTE-Advanced radio frames are realized the synchronous of transmitting-receiving two-end, and carry out the judgement of synchronous tracking and synchronization loss, specifically comprise: when time domain or frequency domain appearance skew, transmitting terminal and receiving terminal proceed to asynchronous state in time, prompting upper strata synchronization loss; After synchronization loss, by upgrading Domain Synchronous point and frequency-domain correction value, make the transmitting-receiving two-end of test platform again enter synchronous state.
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| CN105357751A (en) * | 2015-12-01 | 2016-02-24 | 三维通信股份有限公司 | Method and system for synchronizing time sequence among multiple signal shielding devices based on LTE network frame information |
| CN106332112A (en) * | 2016-11-09 | 2017-01-11 | 重庆文理学院 | Method for implementing synchronization and tracking of LTE-advanced heterogeneous wireless communication network test platform |
| CN112533248A (en) * | 2019-09-19 | 2021-03-19 | 普天信息技术有限公司 | Downlink out-of-step detection method and terminal of LTE-G system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357751A (en) * | 2015-12-01 | 2016-02-24 | 三维通信股份有限公司 | Method and system for synchronizing time sequence among multiple signal shielding devices based on LTE network frame information |
| CN105357751B (en) * | 2015-12-01 | 2018-12-04 | 浙江三维通信科技有限公司 | A kind of method and system of the more signal shielding equipment room synchronous sequences based on LTE network frame information |
| CN106332112A (en) * | 2016-11-09 | 2017-01-11 | 重庆文理学院 | Method for implementing synchronization and tracking of LTE-advanced heterogeneous wireless communication network test platform |
| CN112533248A (en) * | 2019-09-19 | 2021-03-19 | 普天信息技术有限公司 | Downlink out-of-step detection method and terminal of LTE-G system |
| CN112533248B (en) * | 2019-09-19 | 2024-02-27 | 普天信息技术有限公司 | Method and terminal for detecting downlink out-of-step of LTE-G system |
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